Server have conflit ip with itself

I have two netware 5.1 server with SP6. On one server I have this message
at the console and i not understand why.

TCPIP-5.83-344 Warning : duplicate IP Adress in use. Contact your system
administrator

TCPIP-5.83-78 This server and the system having hardware adress 00-02-a5-
87-93 have conflit for IP adress XXX.XXX.XXX.XXX

I have verify the IP address on the network and I don't find conflit.
Sorry for my enghish and thank's for your response